Lifting-truck.



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W. STUEBING, 1R..

-LIFIING TRUCK.

APPLICATION FILED APR. I2` I9I.

,279548 l Patwed Sept. 1T, ISHS.

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1 tension when the Jr., a citizen of the United vsired to lower thelocking parts l check mechanism, and

`innrra.n erariale regresa erntet 'WILLIAM STUEBING, 3R., OF CINCINNATI,OHIO, ASSIGNOR TO THE STUEBING TRUCK COMPANY, OF CINCINNATI, OHIO, A.CORPORATION OF OHIO.

:ferme-TRUCK.

Specicaton of Letters Patent.

Patented Sept., 1*?, 1913.

Application filed April 12, 1916. .Serial No.'90,756.

To all w hom t may concer/n:

Be it lznown that I, WILLIAM S'r'UnisiNc, States, residing at the cityvof Cincinnati, in the county of Ilaiiiilton and State of Ohio, haveinvented certain new and useful Improvements in Lifting-'I`rucks, ofwhich the following is a specification.

My invention relates to check mechanism used in connection with liftingtrucks, which check aiu-,l govern the downward movement of the liftingplatform of such lifting trucks,

keeping the same from falling suddenly or with a thud gand it relatesmore particularly te means connected with said check mecha- `nism sothat the elevating platforin'can he pulled down into normal positionwhen it is empty and unloaded.

r1`he lifting platform, when raised, is usually locked in position, sothat the load can he moved to any point, and when it is dethe loadedlifting` platform, are released, and the fluid check-will allow the loadto gradually fall with the elevating platform, to normal position. f

`When the lifting` platform is not loaded or empty and is in'an elevatedposition, and it is desired to lower thel same, itis first unlocked fromits elevated position and the operator presses on said lifting platformwith his foot or stands thereon in order to start it on its downwardcourse; I overcome this hy a spring I use in connection with my check.vmechanism which is placed at a lifting platform is elevated and whenreleased the tension of the spring pulls down said platform.V

In the accompanying drawing, part of this specification.

Figure 1, is i plan view of forming the liftiii g truck,

Fig. 2, is a side view, the elevating platform being raised,

Fig. 3, is a similar view with the elevating platform partly lowered,

Fig. 4, is a longitudinal section of the Fig. 5, is Fig. 4.

The truck is formed of a lower 'frame consisting of 'a front head 1, tworearwardly extending connecting hars 2 connected to across-section online 55 of 'connect a spring 27.

part beingin full lines,v

the pawl 30, and lextending forward the back axle 3 and connected in thefront with the head 1 through the pins 1 and 5. This lifting'orelevating platform of the truck consists of two links 6, fulcrumed onthe shaft 3 and carrying at their other hear ing ends the shaft 7, seeFig. 1. To the shaft T I connect on both sides the link bars 8,extending forward to the front of the truck and connected through thepins 9 to the links v10. The links 10 in turn are connected through pins.4 to the. front head. I l

In the front head 1, I carry the bearing 12 and through this bearing Ioperate the fork 13 carrying at its bottoni end the bear inUs.15-15, andthrough these bearings I a shaft 16 and on said shaft I place the twofront wheels 1T on the outside of the fork 13, the shaft 16 making ahearing for the said wheels. On the shaft 3 I place the rear wheels 18,thus constructing a four wheeled device.

The fork 13 with its bearing 19 operating in bearing 12 will allow thetwo front wheels 17 Ato swivel as in the manner of wagons.

The fork 13 is constructed with a flange 4.0, which flange. acts as athrust hearing against the face\ of the bearing 12 on head 1 thussupporting, through the agency of the wheels 17 and forl 13, the head 1.

At the other end of fork 13, I carry the two bearings 20-20, throughthese bearin gs I place the shaft 21 in such a position as to lock thefork 13 between lower face .of nearing 12 in the head 1. Iiv

otally connected on shaft 21 and operating between the bearings 20-20 offork 13, I connect the handle, lever or tongue 22.

At the lower end of the handle 22 I provide the bearing point 23, towhich I connect the hook 24 through pin 25. Entending away from hearing23 is a short arm' 26. Between the tongue 22 and the hookv 2a, I Theshort arin 26 acts as a stop for hook 24 limiting its travel, when thespring 27 operates hook hack into its normal position, which operationwill be hereinafter described.

On the top of the head 1, I-place the bean ing 28 carrying a pin 29,which pin supports pawl, I provide the treadle 31; the twc ha ing madeintegral and operate on .the pin 29 as a pivotal point.

to pull said on the g the upper and To the pawl 30 l connect the spring32 -which at its other end is fastened to front head l at point 33. i

@n the elevating platform l connect the bridge 3l extending across theplatform and connecting at each side with link bars Sw, and en thebridge, at its front l place an engaging hoolr 35 for the hook 24 andanother engaging hooli; 36 for the pawl 30.

At the rear the bridge 3l is provided with a raised abutment 37 whichlimits the forward movement of the platform upon which the articles tobe lifted are placed; these platformsare usually made of wood and areraised so that the truck can be placed under them when down in order toelevate the same.

lo operate the truck when the elevating platform in its lowest position,the operator forces the hook 24 down into engagement with the hook 35 onbridge 34, as shown in lliig. 2, the handle is then pulled into ahorizontal position forcin r the link bars 8 which are connected to thebridge 34, to elevate on the links 10 and allow the pawl 30 to engagewith the hook 36 on bridge 34, thus locking the elevated platform withits load, and to disengage the hook 24 the operator again raises handle22 and this forces the hook .fl rearwardly, until it passes out ofcontact with the hook 35, and then, through the spring 2? the hook 24 is.quickly and automatically pulled up into normal position against stop26, sce Fig. 5; the spring 27 having heen placed at tension when thehook 24 was rst placed into engagement with the hook 35.

After the platform is raised and locked into position and the hook 24has automatically been released from hook 35, the tongue or lever 22 isthen free to turn in a complete circle laterally, thus allowing the fork13 which carries the two front wheels 17 to turn in all directions. l/Vhen the elevating platforn'l is down the handle, and frontjw'eels canalso be moved laterally and in 'a'.Y circle the saine as when theplatform is elevated; thus it will be seen that the handle and wheelsare free to turn in all directions when the platform is down or up,

lin order to lower the elevating platform aft-er it has been elevated,the operator steps on treadle part 31 of pawl 30, thus disconnectingpawl 30 from hook 36, allowing the platform to desceml.

. l will now describe my fluid check and its operation. ln order tocarry out my invention, l attach, to the cross-bar 38, on the lowerframe part 2, two dii/'erging liars 50Min), which at their forward endsare attached to the side links 2-2. 'To said cross bar 38, ll attach afork 5l and in this fork l fulcrum the rear end 52 of the check, throughniediinn hfpin 53. To the rear end 52 of the check l attach the cylinder54 of said check nera/iai.

and into this cylinder passes the piston` rod Un the piston rod, at itsreal', latach a piston or piston head 56. rl`he pistonicarries a washeror piston ring 57 to keep 1t tight against the insidewall of thecylinder.

At one end of the piston I place a valve 58, held against the piston` byspring 59, which spring is held in place by a washer held by pin 61.llhroagli the piston l place the passage ways or elongated slots 62, inthe present instance using three. Through the valve 58, I place aby-pass63, throughwhlch oil can pass into an annular recess 64 in the pistoninto the space 71 in cylinder in front of the piston, when the loaded orunloaded elevating platform is lowered.

At its forward end the cylinder 54 is closed by a cap .or head 65, intowhich is placed a stuffing box 66, and a stuli'er 67. The piston rod 55is pivotally attached toa forked part 68, which in turn is connected toshort arm 69, made integral with the bridge 3l of the lifting orelevating platform.

Around the piston rod 55 and between the piston 56 and the part or head65, I place a coiled spring 70.

lt will readily he apparent that when the elevating or lifting platform,with the load, is elevated, as above set forth in the operation of thetruck itself, the upward and forward movement, by reason of piston rod55 heilig connected as described to bridge 34 on the elevating platform,will follow the operation of said lifting platform and move upward andforward therewith; thus pulling out said piston rod 55 and piston 56 andconnections, and thus place a tension on the spring 70, the oil in spaceZ 1, during this opveration being forced through the elongated slots 62in the piston 56 into the space 72 back of the piston; the force liftingvalve 58 oil its seat and when the lifting operation is complete, thespring 59 forces valve 58 again against the piston 56 and as long as theplatform remains elevated, the parts will remain in this position, but,as soon as the elevating platform is released, the oil in the space 72in rear of the piston which has passed there during the liftinoperation, will slowly run or seep throng luy-pass 63 into the annularrecess 64 in the piston, into space 7l forward of the piston 56, thisopera'- tion continues until the oil has passed into said space Z1forward of the piston 56, Vby this tune the lifting platform is down inposition again. A

This fluid check will operatel perfectly when a load is on the liftingor elevatin i platform and the locking means are release and variousforms of fluid checks have been used for this purpose, but when theplatn form is in an elevated position and locked, without a load, it hasbeen necessary when the locking mechanism has been released to give theelevating platform an initial down- Iso ward movement by some manualmeans, as for instance, by standing on the platform or pushing downwardupon it; but with my spring which is placed at a tension when theelevating platform has been pulled up or lifted, will by itself pulldown the lifting platform without the interposition of manf ual means,and this is one of the features 'of my invention.

It will be understood that this check and a tension device may be usedby me in connection with any form of lifting truck and it will also beevidentthat the same is capable of some modification, and I- do'not Wishto limit myself to the precise construction herein shown and described.l

lVbat I claim as new and my invention and-desire to secure by LettersPatent, s:

l. In a lifting truck, a frame, a platform elevatable with respect tosaid frame, means to hold said platform in elevated position,l a fluidcheck device connected to said frame and platform, and a spring carriedby said check device, said spring being arranged to be stressed by. saidcheck device when the platform is elevated Vwhereby upon the release ofsaid platform from its holding means an initial downward impetus isgiven said platform b v said spring.

2. ln a lifting truck, a frame, a platform elevatable with respect tosaid frame, means to bold said platform in elevated position, a fluidcheck device connected to said frame, and platform, a spring carried bysaid check device, said spring being arranged to be elevatable withrespect to said frame, means to hold said platform in elevated position,a

fluid check device connected to said frame and platform, a spring, saidspring operating in connection with said Huid check and arranged to beplaced under strain when the platform is elevated, whereby upon the release ofv said platform from lts holding means'an initial downwardimpetus is given i said platform by said spring.

4. In a lifting truck, a frame, a platform elevatable with respect tosaid frame, means to hold said platform in elevated position, a iiuidcheck device connected to said frame and platform, a spring, said springarranged to be placed under strain when the platform is elevated,whereby upon the release of said platform from its holding means aninitial downward impetus is given said platform by said spring.

Signed at Cincinnati, Hamilton county, Ohio, this 25th day of January,1916.

wiLLrAM STUEBING, JR.

lVitnesses 4 JOHN WV. STREHLI,

L. DUNLAR.

